Meaning of OPERATOR in English

OPERATOR

n. 1 a person operating a machine etc., esp. making connections of lines in a telephone exchange. 2 a person operating or engaging in business. 3 colloq. a person acting in a specified way (a smooth operator). 4 Math. a symbol or function denoting an operation (e.g. x, +).

[ LL f. L operari (as OPERATE) ]

Concise Oxford English dictionary.      Краткий оксфордский словарь английского языка.